Summary
The appearance and distribution of AChE activity in the neural crest cells of the chick embryo were histochemically investigated. Prior to closure of the neural tube, neural crests were not demonstrated and most of the cells constituting the neural plate and the more lateral ectoderm were AChE-negative. With the closure of the neural tube, the neural crests assumed the form of a cell mass in its mid-dorsal portion and AChE activity was demonstrated in some elements of both tube and crests. The neural crest cells beginning to migrate ventrally or laterally were AChE-positive, and some showed intense enzymatic activity. Electron microscopically, the neural crest cells and the cells migrating from the neural crest displayed AChE activity in the cisternae of the nuclear envelope and in a few r-ER profiles, but were morphologically undifferentiated. As assessed by 3H-thymidine autoradiography, these cells possessed the potential to proliferate. These findings indicate that with the formation of the neural tube and neural crest, cells constituting these structures begin to differentiate with respect to AChE activity and that the enzyme appears in the neural crest cells before the onset of neuronal differentiation.
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Miki, A., Fujimoto, E. & Mizoguti, H. Acetylcholinesterase activity in neural crest cells of the early chick embryo. Histochemistry 78, 81–93 (1983). https://doi.org/10.1007/BF00491114
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DOI: https://doi.org/10.1007/BF00491114